Malicious PDF — malware analysis report

Static analysis result for SHA-256 11193c796a473bb3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 17:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de72840a3d3ae44772cc7573ea41af72 SHA-1: 79080d503e480a405ef01b44959a242fe741f641 SHA-256: 11193c796a473bb3bbd53f29fa5ca99a777f59a8261fadc91c5431b6b81e1e66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these links indicates a likely spearphishing attachment attack vector, aiming to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160744e17e7ad7---bipubemuxawegolivibi.pdf In PDF document text
    • http://medicapoland.pl/uploaded/file/lubajedegutige.pdfIn PDF document text
    • http://lukinserv.hu/file/14411108689.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/698471518.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ruwovaloruxamuvubaxokig.pdfIn PDF document text
    • https://baongochoa.com/upload/file/47515406647.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c08c43aa0ed450108279cc9d8660a618/luzew.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a00659271319fea25a55581bfde0818e/geketemusabuparoxo.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/sovanel.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9e9724856a34b543f40e7ebc547e9f17/29564659991.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/gogopixolivoro.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gajejewukuzobel.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/oo5fmlomu4imqbs5v9elkpavkc/kesanija.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/71173174388.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/89624419537.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718290ead28---pefolekoxolaf.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/43c931271db406e50d70e0402c5bcf36/wulojigama.pdfIn PDF document text
    • https://tomas-music.com/contents//files/51850631508.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/94489844687.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/93689943710.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/tewabewalubefowixokamuda.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86693635739.pdfIn PDF document text
    • http://siembra.me/uploads/files/tibupawogemuge.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095a857d93f6---muvatoxoxinovarixim.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa7fa5863---92586016783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=consumer+behavior+articles+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 11220 bytes
SHA-256: b06dd4df6d87210e0a904e41cbd2d4f1e440277b81df90c917f044d00ad4e73e
font_02_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 17508 bytes
SHA-256: 124ca8ddef82137887708bd8e3f00387c470f6878b06b764ccb533ca66e859d3

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